11.3.6.4
Control of the auto-reclosing open time for shot 1
Up to four different time settings can be used for the first shot, and one extension time.
There are separate settings for single- and three-phase auto-reclosing open time,
t1 1Ph
,
t1 3Ph
. If no particular input signal is applied, and an autoreclosing program with single-
phase reclosing is selected, the auto-reclosing open time
t1 1Ph
will be used. If input
signal TR3P is activated in connection with start, the auto-reclosing open time for three-
phase reclosing is used.
An auto-reclosing open time extension delay,
tExtended t1
, can be added to the normal
shot 1 delay. It is intended to come into use if the communication channel for permissive
line protection is lost. In such a case there can be a significant time difference in fault
clearance at the two ends of the line. A longer “auto-reclosing open time” can then be
useful. This extension time is controlled by setting parameter
Extended t1
=
Disabled
and
the input PLCLOST.
11.3.6.5
Long trip signal
In normal circumstances the trip command resets quickly due to fault clearing. The user
can set a maximum trip pulse duration
tTrip
. When trip signals are longer, the auto-
reclosing open time is extended by
tExtended t1
. If
Extended t1
=
Disabled
, a long trip
signal interrupts the reclosing sequence in the same way as a signal to input INHIBIT.
AND
AND
AND
initiate
PLCLOST
AND
Extend t1
long duration
pickup
Extended t1
AND
(block STBRREC)
OR
0
0-
tTrip
ANSI10000255-1-en.vsd
ANSI10000255 V1 EN
Figure 179:
Control of extended auto-reclosing open time and long trip pulse
detection
Section 11
1MRK 506 335-UUS A
Control
382
Technical manual
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